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Does the S6700 provide only optical ports

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Ports of two S6700EI models are all 10GE optical ports. These ports can function as GE electrical ports when they have GE copper modules installed.
The S6720EI and S6720S-EI have 10GE optical ports and 40GE optical ports. 10GE optical ports can function as GE electrical ports when GE copper modules are installed.
You can use Enterprise Network Product Hardware Query Tool to query specified models.

Other related questions:

In the S5700 series, the S5720-28X-LI-24S-AC/DC, S5720S-28X-LI-24S-AC, S5720-28X-SI-24S-AC/DC, S5721-28X-SI-24S-AC/DC, and S5720-32C-HI-24S-AC provide 28 optical ports and 8 electrical ports. Eight optical ports and eight electrical ports are multiplexed into combo ports. A combo port works as either an optical port or an electrical port.
When the S5710-108C-PWR-HI has two cards with 16 optical ports installed, it meets the above requirement.

S6700 10000M port can connect to the 1000M optical module.
In V100R006C00SPC800, when the S6700 10000M port connects to a GE optical module, the port rate switches to 1000M and works in non-auto-negotiation mode. If the 10000M port connects to the 1000M optical port on the peer device, the 10000M port can become Up only when the peer device works in non-auto-negotiation mode. After the S6700 has V100R006SPH005 installed and the S6700 10000M port connects to a GE optical module, you can run the negotiation auto command to switch the port to auto-negotiation. In this case, the 10000M port can connect to the 1000M optical port in auto-negotiation mode.
In later versions of V100R006C00SPC800, when the S6700 10000M port connects to a GE optical module, the port rate switches to 1000M and works in auto-negotiation mode.

An FIU board has a total of seven optical ports.
The IN/OUT optical port is used to receive and transmit line optical signals.
The RC/TC optical port is used to receive and transmit optical signals of the main optical channel.
The RM/TM optical port is used to receive and transmit optical signals of the supervisory channel.
The MON optical port is used to output optical signals to the spectrum analyzer board for online optical performance monitoring.